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<br />I- <br /> <br />, OO.YEAR FLOOD PLAIN <br /> <br />-I <br /> <br />FLOOOWAY <br />FRINGE <br /> <br /> <br />FLOODWAY <br /> <br />F LOOOWA Y <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHtN FLOODWAV <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br /> <br />o <br /> <br />SURCHARGE. <br /> <br />FLOOD ELEVATION <br />BEFOREENCAOACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFOAE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />.SURCHARGE IS NOTTO EXCeED 1.0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />To establish actuarial insurance rates, data from the engineering study <br />must be transformed into flood insurance criteria. This process <br />includes the determination of reaches, Flood Hazard Factors, and flood <br />insurance zone designations for each flooding source studied in detail <br />affecting the Town of Hotchkiss. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as sections of flood plain that have <br />relatively the same flood hazard, based on the average weighted <br />difference in water-surface elevations between the 10- and 100- <br />year floods. This difference may not have a variation greater <br />than that indicated in the following table for more than 20 <br />percent of the reach: <br /> <br />Average Difference Between <br />10- and 100-Year Floods <br /> <br />Variation <br /> <br />Le ss than 2 fee t <br />2 to 7 feet <br />7.1 to 12 feet <br />More than 12 feet <br /> <br />0.5 foot <br />1. 0 foot <br />2.0 feet <br />3.0 feet <br /> <br />12 <br />